Access control Security measures 17 Computer networks 14 Computers 14 Computer security 10 Passwords 7 Data protection 5 Public key infrastructure (Computer security) 4 Mobile communication systems 3 Cell phones 2 Data encryption (Computer science) 2 Wireless LANs 2 Wireless communication systems 2 Biometric identification 1 Business records 1 Cell phone systems 1 Code division multiple access 1 Cryptography 1 Database management 1 Design and construction 1 Dislocation 1 Electronic filing systems 1 Electronic government information 1 Electronic information resources 1 Electronic mail messages 1 Enterprise application integration (Computer systems) 1 Equipment and supplies 1 Freedom of information 1 Government information 1 IEEE 802.11 (Standard) 1